TWI481112B - Mobile communication device and antenna device - Google Patents

Description

Mobile communication device and antenna device

The present invention relates to a mobile communication device, and more particularly to a mobile communication device and an antenna device, which are operable in a Long Term Evolution (LTE) system and a Wireless Wide Area Network (WWAN).

Today, second-generation (2G) or third-generation (3G) communication system technologies have been used in notebooks, tablets, or mobile phones. Telecom manufacturers around the world are proactively introducing fourth-generation (4G) long-term evolution systems. Therefore, the antenna needs to be designed in a small space and can operate in the frequency band of the long term evolution system and the wireless wide area network.

At the same time, mobile communication devices also need to have Bio-Compatibility, which is a lower specific absorption rate (SAR) and Hearing-Aid Compatibility (HAC). One solution to this is to place an antenna at the bottom of the mobile communication device. However, there is usually a data transmission interface at the bottom of the mobile communication device for transmitting or receiving data. This data transmission interface significantly affects the performance of the antenna.

In view of this, the present invention provides a mobile communication device and an antenna device.

The present invention provides a mobile communication device comprising: a system circuit board including a system ground plane; and an antenna including an antenna dielectric substrate parallel to the system ground plane; a first radiating element disposed on the antenna dielectric substrate; and a second radiating element And disposed on the antenna dielectric substrate; the antenna ground plane is disposed on the antenna dielectric substrate and coupled to the system ground plane; and the transmission line is disposed on the antenna dielectric substrate, coupled to the first radiating element and the second The radiating element has a feed line with a feed point.

The present invention further provides an antenna device comprising: a system ground plane; an antenna dielectric substrate parallel to the system ground plane; the first radiating element disposed on the antenna dielectric substrate and coupled to the system ground plane; the second radiating element, The first branch is disposed on the antenna dielectric substrate and coupled to the system ground plane; and the transmission line is disposed on the antenna dielectric substrate, and the transmission line includes a first branch and a second branch, wherein the first branch is adjacent to the first radiating element and includes a chip inductor, and the first branch is coupled to the feed point; and the second branch is coupled to the feed point.

The mobile communication device and the antenna device provided by the invention can reduce the signal interference of the data transmission component to the mobile communication device or the antenna device, and have good biocompatibility.

Certain terms are used throughout the description and following claims to refer to particular elements. Those of ordinary skill in the art should understand that a manufacturer may refer to the same component by a different noun. The scope of this specification and the subsequent patent application do not use the difference of the names as the means for distinguishing the elements, but the difference in function of the elements as the criterion for distinguishing. The words "including" and "including" as used throughout the specification and subsequent claims are an open term and should be interpreted as "including but not limited to". In addition, the term "coupled" is used herein to include any direct and indirect electrical connection. Indirect electrical connections include connections through other devices.

FIG. 1A is a schematic diagram of a mobile communication device 100 in accordance with an embodiment of the present invention. As shown in FIG. 1A, the mobile communication device 100 includes a system board 11 and an antenna 13. The system board 11 can include a system ground plane 12, wherein the system ground plane 12 further includes a protruding ground plane 121 that is located at the edge of the system ground plane 12.

FIG. 1B is a schematic diagram of an antenna 13 in accordance with an embodiment of the present invention. As shown in FIG. 1B, the antenna 13 includes a first radiating element 131, a second radiating element 132, an antenna substrate 133, an antenna ground plane 134, and a transmission line 135. The antenna dielectric substrate 133 is substantially parallel to the system ground plane 12. The first radiating element 131 and the second radiating element 132 are disposed above the antenna dielectric substrate 133. The antenna ground plane 134 is disposed on the antenna dielectric substrate 133 and electrically connected to the system ground plane 12 by a shorting point 137. The antenna ground plane 134 may be disposed on the first radiating element 131 and the second radiating element 132. between. In some embodiments, the antenna ground plane 134 can separate the first radiating element 131 from the second radiating element 132. The transmission line 135 is disposed above the antenna dielectric substrate 133 and includes a first branch 135a and a second branch 135b, and the transmission line 135 is electrically connected to the first radiating element 131 and the second radiation, respectively, by the first branch 135a and the second branch 135b Element 132. Transmission line 135 can have a feed point 136 for receiving signals, wherein first branch 135a and second branch 135b are both electrically coupled to feed point 136. In some embodiments, transmission line 135 can be a microstrip line. Specifically, the first radiating element 131 and the second radiating element 132 and the transmission line 135 may be disposed on the first surface E1 of the antenna dielectric substrate 133, and the antenna ground plane 134 may be disposed on the second surface E2 of the antenna dielectric substrate 133, ie, The opposite side of a surface E1. However, in another embodiment, the first radiating element 131, the second radiating element 132, the transmission line 135, and the antenna ground plane 134 may all be disposed on the same surface, such as the first surface E1 or the second surface E2. System ground plane 12, antenna ground plane 134, and transmission line 135 can be made of metal, such as copper or silver.

Referring to FIG. 1A, feed point 136 is electrically coupled to signal source 14 on system board 11 by metal line 15. Similarly, short circuit point 137 is electrically coupled to system ground plane 12 via metal line 16 via via-hole 17 on system board 11.

1C is a schematic diagram of a system circuit board 11 in accordance with an embodiment of the present invention. As shown in FIG. 1C, the region 31 on the protruding ground plane 121 is a projection plane of the antenna ground plane 134. The protruding ground plane 121 may overlap partially or completely with the antenna ground plane 134.

Figure 1D is a schematic illustration of an antenna 23 in accordance with another embodiment of the present invention. The antenna 13 of the mobile communication device 100 can be replaced by an antenna 23. As shown in FIG. 1D, transmission line 135 can include circuit component 638. One of the first branch 135a and the second branch 135b can include the circuit component 638. In some embodiments, circuit component 638 can be a resistive component, an inductive component, or a capacitive component for impedance matching. In accordance with a preferred embodiment of the invention, circuit component 638 is a chip inductor.

FIG. 1E is a schematic diagram of an antenna 33 in accordance with another embodiment of the present invention. The antenna ground plane 134 may not be disposed between the first radiating element 131 and the second radiating element 132. As shown in FIG. 1E, the antenna ground plane 134 is disposed on one side of the antenna dielectric substrate 133, and the first radiating element 131 and the second radiating element 132 are disposed on the other side of the antenna dielectric substrate 133. The location of the antenna ground plane 134 has no significant effect on the performance of the mobile communication device 100. Similarly, FIG. 1F is a schematic diagram of an antenna 43 in accordance with another embodiment of the present invention. As shown in FIG. 1F, the antenna ground plane 134 may not be disposed between the first radiating element 131 and the second radiating element 132, and one of the first branch 135a and the second branch 135b may include the circuit element 638. The antenna 13 of the mobile communication device 100 can be replaced by an antenna 23, 33 or 43. As such, the mobile communication device 100 will still function normally.

2A is a side elevational view of the mobile communication device 100 in accordance with an embodiment of the present invention. As shown in FIG. 2A, the data transmission component 55 can be disposed between the protruding ground plane 121 and the antenna ground plane 134 to reduce interference, wherein the data transmission component 55 can be, for example, a universal serial bus (USB). ). The data transmission component 55 provides a data transmission interface between the mobile communication device 100 and an external device. 2B is a side elevational view of the mobile communication device 100 in accordance with another embodiment of the present invention. As shown in FIG. 2B, data transfer assembly 55 can be placed below system ground plane 12 to reduce interference.

Figure 3 is a schematic diagram 300 of the return loss of the antenna 13 in accordance with an embodiment of the present invention. Figure 3 is used to illustrate the relationship between frequency and return loss, where the unit of return loss is dB and the unit of frequency is MHz. As shown in FIG. 3, the antenna 13 covers the first frequency band 31 and the second frequency band 32 according to a criterion set to 6 dB. The first frequency band 31 is from 704 MHz to 960 MHz, and the second frequency band 32 is a frequency band from 1710 MHz to 2690 MHz. In another embodiment, the first frequency band 31 is from 824 MHz to 960 MHz and the second frequency band 32 is from 1710 MHz to 2170 MHz. It should be noted that the antennas 23, 33 or 43 may also cover the same frequency band as the antenna 13. Therefore, the antenna 13, 23, 33 or 43 of the configurable mobile communication device 100 covers the bands of LTE700/GSM850/900 and GSM1800/1900/UMTS/LTE2300/2500 (ie, eight bands of LTE/WWAN).

4A is a schematic diagram of a monopole antenna 401 in accordance with an embodiment of the present invention. 4B is a schematic diagram of a loop antenna 402 in accordance with another embodiment of the present invention. It is noted that the monopole antenna 401 can be curved and the loop antenna 402 can be other shapes, such as rectangular or triangular. Each of the first radiating elements 131 and the second radiating elements 132 may be a monopole antenna 401 or a loop antenna 402.

In some embodiments of the present invention, the size of the components in the mobile communication device 100 can be as follows: the area of the system circuit board 11 is about 112 mm x 60 mm; the area of the system ground plane 12 is about 100 mm x 60 mm and the shape is rectangular; The area of the ground 121 is approximately 12 mm x 10 mm; the area of the antenna ground plane 134 is approximately 12 mm x 10 mm and is rectangular in shape; and the metal lines 15, 16 are both 5 mm in length and 1 mm in width. It should be noted that the size of the elements in the above embodiments is not limited thereto. Anyone skilled in the art can adjust the size of the component based on the frequency band and the dielectric constant.

FIG. 5A is a schematic diagram of an antenna device 500 in accordance with an embodiment of the present invention. Referring to FIG. 5A and FIG. 1A together, the antenna device 500 is designed to have the same basic structure as the mobile communication device 100. The antenna device 500 includes a system circuit board 51 and an antenna assembly 53. The system board 51 can include a system ground plane 52, wherein the system ground plane 52 includes a protruding ground plane 521 that is located at the edge of the system ground plane 52. It should be noted that the antenna device 500 may include only the system ground plane 52 without the system board 51 and the antenna assembly 53 being disposed.

Figure 5B is a plan view of an antenna device 500 in accordance with an embodiment of the present invention. As shown in FIG. 5B, the antenna assembly 53 includes a first radiating element 531, a second radiating element 532, an antenna dielectric substrate 533, an antenna ground plane 534, and a transmission line 535. The antenna dielectric substrate 533 is substantially parallel to the system ground plane 52. The first radiating element 531 and the second radiating element 532 are disposed on the antenna dielectric substrate 533 and electrically connected to the system ground plane 52 by short-circuiting through holes S1 and S2, respectively. The first radiating element 531 is U-shaped and electrically connected to the system ground plane 52 via an antenna ground plane 534, wherein the short-circuited via S1 is electrically connected between the first radiating element 531 and the antenna ground plane 534. Similarly, second radiating element 532 is U-shaped and is electrically coupled to system ground plane 52 via antenna ground plane 534, wherein short-circuited via S2 is electrically coupled between second radiating element 532 and antenna ground plane 534. The antenna ground plane 534 is disposed on the antenna dielectric substrate 533 and electrically connected to the system ground plane 52 by a short-circuit point 137 disposed between the first radiating element 531 and the second radiating element 532. The protruding ground plane 521 may partially or completely overlap the antenna ground plane 534. The antenna ground plane 534 can separate the first radiating element 531 from the second radiating element 532. It should be noted that the antenna ground plane 534 may not be disposed between the first radiating element 531 and the second radiating element 532 as shown in FIG. 1E or FIG. 1F. In another embodiment, the antenna ground plane 534 can be removed from the antenna assembly 53 such that the antenna device 500 will still function properly. If there is no antenna ground plane 534, the first radiating element 531 and the second radiating element 532 can be electrically connected directly to the system ground plane 52. The transmission line 535 is disposed over the antenna dielectric substrate 533 and includes a first branch 535a and a second branch 535b. The first branch 535a is adjacent to the first radiating element 531 and is electrically coupled, and the first branch 535a includes a wafer inductor 639, wherein the wafer inductor 639 has an inductance equal to approximately 15 nH. Similarly, the second branch 535b is proximate to the second radiating element 532 and coupled to each other. Transmission line 535 can have a feed point 136 for receiving signals, both first branch 535a and second branch 535b being electrically coupled to feed point 136. In some examples, transmission line 535 can be a microstrip transmission line. System ground plane 52, first radiating element 531, second radiating element 532, antenna ground plane 534, and transmission line 535 can be made of metal, such as copper or silver.

Referring to Figure 5A, feed point 136 is electrically coupled to signal source 54 on system board 51 by a metal wire. Similarly, short circuit point 137 is electrically coupled to system ground plane 52 by another metal line. As shown in FIGS. 2B and 5A, the USB connector 555 can be disposed below the system ground plane 52. In another embodiment, as shown in FIG. 2A, a USB connector 555 can be disposed between the protruding ground plane 521 and the antenna ground plane 534 to reduce interference.

FIG. 5C is a diagram 590 of the return loss of the antenna device 500 in accordance with an embodiment of the present invention. Figure 5C is used to illustrate the relationship between frequency and return loss, where the unit of return loss is dB and the unit of frequency is MHz. As shown in FIG. 5C, the antenna device 500 covers the first frequency band 591 and the second frequency band 592 according to a criterion set to 6 dB. The first frequency band 591 is from 704 MHz to 960 MHz, and the second frequency band 592 is a frequency band from 1710 MHz to 2690 MHz. In another embodiment, the first frequency band 591 is from 824 MHz to 960 MHz and the second frequency band 592 is from 1710 MHz to 2170 MHz.

The first branch 535a is excited with the first radiating element 531, and the second branch 535b and the second radiating element 532 are also excited to form a first frequency band 591. The second branch 535b and the second radiating element 532 are excited to form a second frequency band 592. And the second frequency band is higher than the first frequency band.

In some embodiments of the present invention, the size of the components in the antenna device 500 may be as follows: The system board 51 has a dielectric constant equal to 4.3 (glass fiber dielectric substrate) and a thickness of 0.8 mm. The dielectric constant of the antenna dielectric substrate 533 is equal to 4.3 (glass fiber dielectric substrate) and has a thickness of 1 mm. The area of the antenna ground plane 534 is approximately 60 mm ² , such as 5 mm x 12 mm. The area of the protruding ground plane 521 is approximately 108 mm ² , for example 9 mm x 12 mm. The first branch 535a has a length of about 10 mm and the second branch 535b has a length of about 26.5 mm. The total length of the first radiating element 531 is approximately 60.5 mm and the total length of the second radiating element 532 is approximately 62 mm. It should be noted that the size of the elements in the above embodiments is not limited thereto. Anyone skilled in the art can adjust the size of the component based on frequency bands and dielectric constants.

FIG. 6A is an embodiment of an antenna device 600 in accordance with another embodiment of the present invention. As can be seen from FIGS. 6A and 1A, the antenna device 600 is designed to have the same basic structure as the mobile communication device 100. The antenna device 600 includes a system circuit board 61 and an antenna assembly 63. The system board 61 can include a system ground plane 62, wherein the system ground plane 62 includes a protruding ground plane 621 that is located at the edge of the system ground plane 62. It should be noted that the antenna device 600 may include only the system ground plane 62 and the antenna assembly 63 without the system board 61 being disposed.

Figure 6B is a plan view of an antenna device 600 in accordance with an embodiment of the present invention. As shown in FIG. 6B, the antenna assembly 63 includes a first radiating element 631, a second radiating element 632, an antenna dielectric substrate 633, an antenna ground plane 634, and a transmission line 635. The antenna dielectric substrate 633 is substantially parallel to the system ground plane 62. The first radiating element 631 and the second radiating element 632 are disposed on the antenna dielectric substrate 633 and electrically connected to the system ground plane 62 by short-circuiting through holes S3, S4, respectively. The first radiating element 631 is U-shaped and electrically connected to the system ground plane 62 via an antenna ground plane 634, wherein the short-circuiting via S3 is electrically connected between the first radiating element 631 and the antenna ground plane 634. The second radiating element 632 is L-shaped and electrically connected to the system ground plane 62, wherein the short-circuiting via S4 is electrically connected to the system ground plane 62 by a metal line. The antenna ground plane 634 is disposed on the antenna dielectric substrate 633 and electrically connected to the system ground plane 62 by a short-circuit point 137 disposed between the first radiating element 631 and the second radiating element 632. The protruding ground plane 621 may partially or completely overlap the antenna ground plane 634. The antenna ground plane 634 can separate the first radiating element 631 from the second radiating element 632. It should be noted that the antenna ground plane 634 may not be disposed between the first radiating element 631 and the second radiating element 632 as shown in FIG. 1E or FIG. 1F. In another embodiment, the antenna ground plane 634 can be removed from the antenna assembly 63 such that the antenna assembly 600 will still function properly. If there is no antenna ground plane 634, the first radiating element 631 can be electrically connected directly to the system ground plane 62. The transmission line 635 is disposed over the antenna dielectric substrate 633 and includes a first branch 635a and a second branch 635b. The first branch 635a is adjacent to the first radiating element 631 and coupled to each other, and the first branch 635a includes a wafer inductor 639, wherein the wafer inductor 639 has an inductance value approximately equal to 15 nH. On the other hand, the second branch 635b need not be in proximity to the second radiating element 632. Transmission line 635 can have a feed point 136 for receiving signals, wherein first branch 635a and second branch 635b are both electrically coupled to feed point 136. In some embodiments, transmission line 635 can be a microstrip transmission line. System ground plane 62, first radiating element 631, second radiating element 632, antenna ground plane 634, and transmission line 635 can be made of metal, such as copper or silver.

Referring to Figure 6A, feed point 136 is electrically coupled to signal source 64 on system board 61 by a metal wire. Similarly, short circuit point 137 is electrically coupled to system ground plane 62 by another metal line. As shown in FIGS. 2B and 6A, the USB connector 655 can be disposed below the system ground plane 62. In another embodiment, as shown in FIG. 2A, a USB connector 655 can be disposed between the protruding ground plane 621 and the antenna ground plane 634 to reduce interference.

Figure 6C is a diagram 690 of the return loss of the antenna device 600 in accordance with an embodiment of the present invention. Figure 6C is used to illustrate the relationship between frequency and return loss, where the unit of return loss is dB and the unit of frequency is MHz. As shown in FIG. 6C, the antenna device 500 covers the first frequency band 691 and the second frequency band 692 according to a criterion set to 6 dB. The first frequency band 691 is from 704 MHz to 960 MHz, and the second frequency band 692 is a frequency band from 1710 MHz to 2690 MHz. In another embodiment, the first frequency band 691 is from 824 MHz to 960 MHz and the second frequency band 692 is from 1710 MHz to 2170 MHz.

The first branch 635a and the first radiating element 631 are excited to form a first frequency band 691. The second branch 635b and the second radiating element 632 are excited to form a second frequency band 692. And the second frequency band is higher than the first frequency band.

In some embodiments of the invention, the size of the components in antenna device 600 may be as follows: system board 61 has a dielectric constant equal to 4.3 (glass fiber dielectric substrate) and a thickness of 0.8 mm. The dielectric constant of the antenna dielectric substrate 633 is equal to 4.3 (glass fiber dielectric substrate) and has a thickness of 1 mm. The area of the antenna ground plane 634 is approximately 60 mm ² , such as 5 mm x 12 mm. The area of the protruding ground plane 621 is approximately 120 mm ² , for example 10 mm x 12 mm. The first branch 635a has a length of about 17 mm and the second branch 635b has a length of about 18 mm. The total length of the first radiating element 631 is approximately 65 mm and the total length of the second radiating element 632 is approximately 22 mm. It should be noted that the size of the elements in the above embodiments is not limited thereto. Anyone skilled in the art can adjust the size of the component based on frequency bands and dielectric constants.

The present invention provides a mobile communication device and an antenna device that can cover eight frequency bands of a 4G communication system LTE/WWAN. The mobile communication device and the antenna device are further configured to be equipped with an accomm-odate data transmission component, such as a USB connector. Due to the shielding of the system ground plane (including the protruding ground plane) or the antenna ground plane, the influence of the data transmission component on the mobile communication device or the antenna device is small, and the signal interference is also weak. Therefore, the mobile communication device and the antenna device provided by the present invention have good HAC and SAR values.

The terms "first", "second", "third", etc., used in the claims to modify the claim elements are not themselves used to indicate any priority of one claim element or another claim element or The order, or the chronological order of the actions performed, is used to distinguish claim elements having a certain name from another claim element having the same name.

The present invention has been described above with reference to the preferred embodiments thereof, and is not intended to limit the scope of the present invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of the present invention is defined by the scope of the appended claims and the equivalents thereof.

100. . . Mobile communication device

11. . . System board

12. . . System ground plane

13. . . antenna

14. . . Signal source

15. . . metal wires

16. . . metal wires

17. . . Through hole

121. . . Outstanding ground plane

131. . . First radiating element

132. . . Second radiating element

133. . . Antenna dielectric substrate

134. . . Antenna ground plane

135. . . Transmission line

135a. . . First branch

135b. . . Second branch

136. . . Feeding point

137. . . Short circuit point

E1. . . First surface

E2. . . Second surface

31. . . Projection surface

638. . . Circuit component

55. . . Data transmission component

300. . . schematic diagram

31. . . First frequency band

32. . . Second frequency band

401. . . Monopole antenna

402. . . Loop antenna

500. . . Mobile communication device

51. . . System board

52. . . System ground plane

53. . . antenna

54. . . Signal source

521. . . Outstanding ground plane

531. . . First radiating element

532. . . Second radiating element

533. . . Antenna dielectric substrate

534. . . Antenna ground plane

535. . . Transmission line

535a. . . First branch

535b. . . Second branch

639. . . Chip inductance

555. . . USB connector

S1, S2, S3, S4‧‧‧ short-circuited through holes

590‧‧‧ Schematic

591‧‧‧First frequency band

592‧‧‧second frequency band

600‧‧‧Mobile communication device

61‧‧‧System Board

62‧‧‧System ground plane

63‧‧‧Antenna

64‧‧‧Signal source

621‧‧‧ protruding ground plane

631‧‧‧First radiating element

632‧‧‧Second radiating element

633‧‧‧Antenna dielectric substrate

634‧‧‧Antenna ground plane

635‧‧‧ transmission line

635a‧‧ first branch

635b‧‧‧Second branch

655‧‧‧USB connector

690‧‧‧ Schematic

691‧‧‧First frequency band

692‧‧‧second frequency band

1A is a schematic diagram of a mobile communication device according to an embodiment of the present invention;

1B is a schematic diagram of an antenna according to an embodiment of the present invention;

1C is a schematic diagram of a system circuit board in accordance with an embodiment of the present invention;

1D is a schematic diagram of an antenna according to another embodiment of the present invention;

1E is a schematic diagram of an antenna according to another embodiment of the present invention;

1F is a schematic diagram of an antenna according to another embodiment of the present invention;

2A is a side view showing a mobile communication device according to an embodiment of the present invention;

2B is a side view showing a mobile communication device according to another embodiment of the present invention;

3 is a schematic diagram of return loss of an antenna according to an embodiment of the present invention;

4A is a schematic diagram of a monopole antenna according to an embodiment of the present invention;

4B is a schematic diagram of a loop antenna according to another embodiment of the present invention;

5A is a schematic diagram of an antenna device according to an embodiment of the present invention;

FIG. 5B is a schematic plan view of an antenna device according to an embodiment of the invention; FIG.

Figure 5C is a schematic diagram 590 of the return loss of the antenna device according to an embodiment of the present invention;

6A is an embodiment of an antenna device according to another embodiment of the present invention;

6B is a schematic plan view of an antenna device according to an embodiment of the invention;

Figure 6C is a schematic diagram of return loss of an antenna device in accordance with an embodiment of the present invention.

100. . . Mobile communication device

11. . . System board

12. . . System ground plane

13. . . antenna

14. . . Signal source

15. . . metal wires

16. . . metal wires

17. . . Through hole

121. . . Outstanding ground plane

136. . . Feeding point

137. . . Short circuit point

Claims (21)

A mobile communication device comprising: a system circuit board including a system ground plane; and an antenna comprising: an antenna dielectric substrate parallel to the system ground plane; a first radiating element disposed on the antenna dielectric substrate a second radiating element disposed on the antenna dielectric substrate; an antenna ground plane disposed on the antenna dielectric substrate and coupled to the ground plane of the system; and a transmission line disposed on the antenna dielectric substrate Up, coupled to the first radiating element and the second radiating element, and the transmission line has a feeding point, wherein the system ground plane includes a protruding ground plane, and the protruding ground plane and the antenna ground plane part or all overlapping. The mobile communication device of claim 1, wherein a data transmission component is disposed between the protruding ground plane and the antenna ground plane, and the data transmission component provides the mobile communication device and an external device. a data transmission interface. The mobile communication device of claim 2, wherein the data transmission component is a universal serial bus. The mobile communication device of claim 1, wherein the antenna ground plane separates the first radiating element from the second radiating element. The mobile communication device of claim 1, wherein the antenna comprises a first frequency band and a second frequency band, wherein the first frequency band is from 824 MHz to 960 MHz, and the second frequency band is from 1710 MHz to 2170MHz; or the first frequency band is from 704MHz to 960MHz, The second frequency band is from 1710 MHz to 2690 MHz. The mobile communication device of claim 1, wherein the transmission line is a microstrip transmission line. The mobile communication device of claim 1, wherein the transmission line comprises a circuit component. The mobile communication device of claim 7, wherein the circuit component is a chip inductor. The mobile communication device of claim 1, wherein the first radiating element is a loop antenna or a monopole antenna. The mobile communication device of claim 1, wherein the feed point is coupled to a signal source on the circuit board of the system. An antenna device includes: a system ground plane, wherein the system ground plane includes a protruding ground plane; an antenna dielectric substrate parallel to the system ground plane; an antenna ground plane disposed on the antenna dielectric substrate and coupled Connected to the ground plane of the system, the protruding ground plane partially or completely overlaps the ground plane of the antenna; a first radiating element is disposed on the antenna dielectric substrate and coupled to the ground plane of the system; a second radiating element And disposed on the antenna dielectric substrate and coupled to the ground plane of the system; and a transmission line disposed on the antenna dielectric substrate, and the transmission line includes a first branch and a second branch, wherein the first a branch is adjacent to the first radiating element and includes a chip inductor, and the first branch is coupled to a feed point; and the second branch is coupled to the feed point. The antenna device of claim 11, wherein the antenna ground plane separates the first radiating element from the second radiating element. The antenna device of claim 11, wherein a universal sequence bus bar is disposed between the protruding ground plane and the antenna ground plane. The antenna device of claim 11, wherein each of the first radiating element and the second radiating element are U-shaped, and the second branch is adjacent to the second radiating element. The antenna device of claim 14, wherein the first radiating element and the first branch are excited, and the second radiating element and the second branch are excited to form a first frequency band; The second radiating element and the second branch are excited to form a second frequency band; and the second frequency band is higher than the first frequency band. The antenna device of claim 15, wherein the first frequency band is from 824 MHz to 960 MHz, and the second frequency band is from 1710 MHz to 2170 MHz; or the first frequency band is from 704 MHz to 960 MHz, and the first frequency band is The second frequency band is from 1710 MHz to 2690 MHz. The antenna device of claim 14, wherein each of the first radiating element and the second radiating element is coupled to the system ground plane via an antenna ground plane, and the antenna ground plane is disposed on the antenna Above the dielectric substrate. The antenna device of claim 11, wherein the first radiating element is U-shaped and the second radiating element is L-shaped. The antenna device of claim 18, wherein the first radiating element and the first branch are excited to form a first frequency band; the second radiating element and the second branch are excited to form a first a second frequency band; and the second frequency band is higher than the first frequency band. The antenna device of claim 19, wherein the first frequency band is from 824 MHz to 960 MHz, and the second frequency band is from 1710 MHz to 2170 MHz; or the first frequency band is from 704 MHz to 960 MHz, and the first frequency band is The second frequency band is from 1710 MHz to 2690 MHz. The antenna device of claim 18, wherein the first radiating element is coupled to the ground plane of the system via an antenna ground plane, and the antenna ground plane is disposed on the antenna dielectric substrate.